[5][6][7] It shares the same architecture, and mechanical design, and is based on the Buick V6 road car engine.

Though the Buick engine never won a CART series race, it did see some success at the Indianapolis 500, which was sanctioned singly by USAC.

This was largely because USAC permitted the non-overhead cam "stock block" pushrod engines a higher level of turbocharger "boost" (55 inHG) than CART's rules allowed.

Pancho Carter won the pole position with a Buick at the 1985 Indianapolis 500, and Gary Bettenhausen was the fastest qualifier in 1991.

Roberto Guerrero became the first driver to break the 230 mph barrier in time trials, winning the pole for the 1992 race.